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  <pre class="prettyprint lang-js"><span id='global-property-'>/**
</span> * @ignore
 * root node represent a check tree
 * @author yiminghe@gmail.com
 */
KISSY.add(&quot;tree/check-tree&quot;, function (S, CheckNode, TreeManager) {
<span id='KISSY-Tree-CheckTree'>    /**
</span>     * KISSY Checked Tree. xclass: 'check-tree'.
     * @extends KISSY.Tree.CheckNode
     * @class KISSY.Tree.CheckTree
     * @mixins {KISSY.Tree.Manager}
     */
    return CheckNode.extend([TreeManager], {
        handleKeyDownInternal: function (e) {
            var current = this.get(&quot;selectedItem&quot;);
            if (current === this) {
                return this.callSuper(e);
            }
            return current &amp;&amp; current.handleKeyDownInternal(e);
        },

        _onSetFocused: function (v,e) {
            var self = this;
            self.callSuper(v,e);
            // 得到焦点时没有选择节点
            // 默认选择自己
            if (v &amp;&amp; !self.get(&quot;selectedItem&quot;)) {
                self.select();
            }
        }
    }, {
        ATTRS: {
            defaultChildCfg: {
                value: {
                    xclass: 'check-tree-node'
                }
            }
        },
        xclass: 'check-tree'
    });
}, {
    requires: ['./check-node', './tree-manager']
});</pre>
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